It's visual at the top layer (rows, columns) but soon gets very awkward when you're stuffing program statements into small boxes.

There was a big explosion of weird and wonderful visual programming languages in the 1980s, such as CASE tools, loads of commercial 8 bit game-making systems, HP's early 80s workstations, and dozens of BASIC variants (which weren't very visual, but let you draw things with extreme ease). I wonder if there are any under-explored ideas there.